I had a play this morning, the screw you pointed out was tight. I backed out the limiter screw and reset the stitch length to near max. I then tightened the limiter screw, sewing about 5 to the inch when you go to rev it will sew into the same holes but only if you have it in an exact position on the slide. Its as if it needs a set of increments for the spring loaded button to go into. hope this makes sense Thanks again for your help